package day_2022_1_to_2.day16;

import java.util.Arrays;
import java.util.Scanner;

public class Day16_2_2 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        while(sc.hasNext()) {
            String s = sc.nextLine();
            int len = s.length();
            char[] arr = s.toCharArray();
            //排序
            Arrays.sort(arr);
            StringBuffer sb = new StringBuffer();
            for (int i = 0; i < len; i++) {
                sb.append(arr[i]);
            }
            System.out.println(sb);
        }
    }
}
